21100589 has 4 divisors (see below), whose sum is σ = 21240480. Its totient is φ = 20960700.

The previous prime is 21100579. The next prime is 21100601. The reversal of 21100589 is 98500112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21100589 - 2²⁰ = 20052013 is a prime.

It is a super-2 number, since 2×21100589² = 890469712293842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69719 + ... + 70020.

It is an arithmetic number, because the mean of its divisors is an integer number (5310120).

Almost surely, 2^21100589 is an apocalyptic number.

It is an amenable number.

21100589 is a deficient number, since it is larger than the sum of its proper divisors (139891).

21100589 is a wasteful number, since it uses less digits than its factorization.

21100589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139890.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 21100589 is about 4593.5377433956. The cubic root of 21100589 is about 276.3322200205.

The spelling of 21100589 in words is "twenty-one million, one hundred thousand, five hundred eighty-nine".